Closure for concrete mixing drums



Dec. 19, 1939. P, F BER 2,184,251

CLOSURE FOR CONCRETE MIXING DRUMS Original Filed Jan. 8, 1937 IN V EN TOR,

6. M ATTORNEY Patented Dec. 19, 1939 nmrsn 2,184,251 CLOSURE, on concentric MIXING mantis John P. Faber, Dunellen, N. J., assignorto-Ransome Concrete Machinery 00., a corporation of New Jersey Refiled for abandoned application Serial Na.

119,657, January, 8, 1937. April 13, 1939, Serial No. 267,598

This application 3 Claims. (Cl, 220-55 This invention relates to improvements in end closures for discharge openings of concrete mixing drums,

The primary object of my invention is to provide an end closure for the discharge opening of a concrete mixing drum, embodying a construction capable of being tightly closed during the mixing operation and opened to an extent required topermit the discharge of the drums contents.

Another object of my invention is to provide an end closure for the discharge opening of a concrete mixing .drum embodying a novel construction for applying an adequate yielding pressure to the closure after the latter is moved into a closed position, whereby the said closure is normally maintained in a tightly closed position during the mixing operation and While-the drum is in transit.

20 Other and further objects of my invention will be pointed out hereinafter or indicated in the appended claims or will be obvious to one skilled in the art upon an understanding of the pressent disclosure. For the purposes of this application I have elected to show herein certain forms and details of an end closure for mixing drums representative of my invention; it is understood, however, that the embodiment of my invention herein shown and described.- is for the purpose of il- 30 lustration only, and that therefore it is not to be regarded as exhaustive of the variations of the invention, nor is it to be given an interpretation such as might have the eifect of limiting the claims, short of the true and most comprehensive 35 scope of the invention in the art.

In the accompanying drawing illustrating the preferred form of my invention, the figure is a vertical'sectional view taken through the axis of the end portion of a concrete mixing drum showing the end closure for the rear discharge opening of the drum in vertical section and in a closed position.

Referring to the drawing, the numeral l designates a rotatable concrete-mixing drum having a rear discharge opening around which is provided an outwardly flared annular flange l i. The inner face of the flange H constitutes a seat for a suitably shaped closure l2,

Supported axially within the mixing drum it, as by radially disposed tubular braces l3 secured to the side walls of the drum, is a pipe M for supplying water to the interior of the drum. Rigidly secured to the pipe I 4 is a rearwardly disposed screw shait H) which projects axially through the discharge opening of the drum,

Positioned rearwardly of the drums discharge opening is a rotatable hand wheel [6 having an I internally threaded hub H which receives the The hub H is provided with a forwardly disposed reduced portion which loosely extends through an axial opening in the closure E2. The closure is. slidably mounted on the hub and is retained thereon by a split ring it or other suitable means.

Secured as by rivets, bolts or other suitable means to the closure l2 at points around its axial opening is a cap or other suitably shaped.- member having a forwardly disposed sleeve 2! secured thereto as by welding or other suitable means. The sleeve movably extends around the forwardly disposed part of the screw shaft l5 and serves to prevent concrete material from collecting thereon.

Inside the cap 20 is positioned a resilient annular pad 22 having its forward end engaging with the said cap and its rear end contacting with a fiangedring-shaped member 23 which encircles the screw shaft I5 and normally engages with the forward end of the hubll of the hand wheel H6. The combination comprising the member 23, the resilient pad 22 and the cap 2H form a resilient connection between the hand wheel l6 and the closure l2. has once been closed a further turning of the hand wheel 16 in the proper direction causes the resilient pad 22 to be compressed and thereupon exert a firm but yielding pressure on the said closure, thereby normally preventing the latter from opening when the mixing drum is being rotated or moved about. This application is a refile for abandoned application Serial No. 119,657, filed January 8, 1937, entitled Closures for concrete'mixing drums.

Having described my invention, what I claim is: 1. In closure means of the kind described, a mixing drum having an end opening, a nonrotatable screw shaft supported by the drum and extending axially through its end opening, a closure for said opening having an axial opening therein, a nut on the shaft for opening and closing the closure,.the said nut having a part movably extending through the opening of the closure, means on the nut for preventing the detachment of the nut from the closure, and resil- After the closure ient means adapted to be compressed when the nut is manipulated to close the closure, the said resilient means being so constituted and arranged as to exert a yieldable pressure on the closure after the latter is closed.

2. In closure means for concrete-mixing drums, a mixing drum having a rear end opening, a nonrotatable screw shaft supported by the drum and extending axially through the said end opening, a screwable member on the screw shaft, a closure for the drums end opening loosely but non-detachably mounted on and carried by the screwable member, a forwardly disposed cap member secured axially to the closure, and resilient compressible means positioned in the cap member between the screwable member and the forward end of the cap member, the said resilient means being so constructed and arranged as to exert a yieldable pressure on the closure after the said closure is closed and the resilient means is compressed between the cap member and the screwable member.

3. In closure means for concrete-mixing drums, a mixing drum having a conical end portion and a discharge opening in said conical end portion, a non-rotatable screw shaft supported by the drum and extending axially through the discharge opening, a screwable member on the shaft, a closure loosely mounted on and carried by the screwable member, and resilient means interposed between the screwable member and an axial flanged device secured to the forward side of the closure near its axial opening, the said resilient means being adapted to be compressed when the screwable member is actuated to move the closure to a closure position, whereby an added pressure tending to maintain the closure in a tightly closed position may be exerted on the closure after it has been moved to a closed position.

JOHN P. FABER. 

